tests: runtime: in_podman_metrics: fix warnings

[nokute78]

This patch is to fix warnings. Note: in_podman_metrics test failed on a system using cgroup v2. It doesn't relate this patch.

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• [N/A] Example configuration file for the change
• [X] Debug log output from testing the change

• [X] Attached Valgrind output that shows no leaks or memory corruption was found

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• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

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• [N/A] Documentation required for this feature

Backporting

• [N/A] Backport to latest stable release.

Debug/Valgrind output

Note: This test doesn't work on a system using cgroup v2. It doesn't relate this patch.

taka@taka-VirtualBox:~/git/fluent-bit/build$ bin/flb-rt-in_podman_metrics 
Test regular...                                 [2023/04/22 10:23:13] [ info] [fluent bit] version=2.1.1, commit=840d52649b, pid=6091
[2023/04/22 10:23:13] [ info] [storage] ver=1.2.0, type=memory, sync=normal, checksum=off, max_chunks_up=128
[2023/04/22 10:23:13] [ info] [cmetrics] version=0.6.1
[2023/04/22 10:23:13] [ info] [ctraces ] version=0.3.0
[2023/04/22 10:23:13] [ info] [input:podman_metrics:podman_metrics.0] initializing
[2023/04/22 10:23:13] [ info] [input:podman_metrics:podman_metrics.0] storage_strategy='memory' (memory only)
[2023/04/22 10:23:13] [ info] [input:podman_metrics:podman_metrics.0] Using config file /home/taka/git/fluent-bit/tests/runtime/data/podman/regular/config.json
[2023/04/22 10:23:13] [ info] [input:podman_metrics:podman_metrics.0] Detected cgroups v2
[2023/04/22 10:23:13] [ info] [input:podman_metrics:podman_metrics.0] Generating podman metrics (initial scrape)
(snip)
[ OK ]
FAILED: 2 of 6 unit tests have failed.
==6109== 
==6109== HEAP SUMMARY:
==6109==     in use at exit: 0 bytes in 0 blocks
==6109==   total heap usage: 7,537 allocs, 7,537 frees, 3,135,453 bytes allocated
==6109== 
==6109== All heap blocks were freed -- no leaks are possible
==6109== 
==6109== For lists of detected and suppressed errors, rerun with: -s
==6109== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

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Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

[nokute78]

I rebased to merge #7267

[github-actions[bot]]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[nokute78]

ping

[github-actions[bot]]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[cosmo0920]

ping. 🏓

[github-actions[bot]]

This PR is stale because it has been open 45 days with no activity. Remove stale label or comment or this will be closed in 10 days.